In one case who entered remission after the treatment of eosinophilia and associated T-lymphoblastic lymphoma and recurrent eosinophilia, complex translocations between chromosomes 7, 12 and 16 were detected, while FISH analysis revealed that the ETV6 gene (12p13) was responsible for the clonality (6). The gene discussed is ETV6; the disease is T-lymphoblastic lymphoma.